Holder for dentistry work



vspl 22, 1931. M. FLlscHHAcKER 1,824,398

HOLDER FOR DENTISTRY, WORK Filed April 9, 1929 zo 27 ZZ Patented Sept. 22, 1931 `UMAX rin'rscniiacxna; or iIANovnn, GERMANY i j nomineren. DEN'rrsTitY WORK Applicatimi inea `iiprii 9,1929; serial No.

This invention refers'broadly to aninstrnmentality to be employed in the .dental art for the simultaneous .operation of more than one tool or toolholders angnlarly displaceable or rotatable with relation toeach other and disposed in er upon asuitable frame or the like carrying the .operating means for the tools or tool-holders.A n Amongv` other important novel features andv advantages my invention is distinguished 'from the previous art; by the fact thatall thegear wheels, screw-Wheels, worms or thelike for the operation of ;the` relatively angularly displaceable tools or toollliolders the active parts of which are set'or adjustedV to cause them to be operated withytheirjaxesin an absolutely parallel direction arerall contained in tightly closable chambersiorhous# ings, and in View thereof it is 'a further object of myI invention 'to provide for-parallel` adjustment of said tools or tool-holders" and torv provide meansto exclude thefinluences of endwise or` lateral thrusts .onisaid; tools or tool holders and on the active'partsthereof, and to so'` arrange thel driving Sandfop erating gear wheels or the like vthat no packing orjamm'ing action ,on said wheels-and on the marginal portions "thereof may occur, so as to bringdown the paralleland other adjustmentsy to a nicety andpractically free from disturbing"icauses;V` In'accordance with one of the preferred embodiments of my invention the` absolutely level and parallel adjustment of the'eoperatingstools and of the guiding armsfor stems therefor may be obtained by the vuseofa til-shaped pieceof steel wire with. parallel legs which latter preferably possess the thickness Yof a tool=shaft. Other objects of my invention refer to thesetting andlocking vmeans and the like for the angularly movable' and toolcarrying arms `which may be secured-in position by `means of set screws preferably di's-Y posedf in the frame or casingof'theldevice,

' which is closed on allsides and in which the stems of the screws and the ends of the 'arms areljlioused, so asto-adaptfthefends of said screws to become engaged with suitable screw threads or holes provided in the an; gularly movable arms, whilel the heads of 353,714,9and iii Germany April 17, i928.

saidscrews are situated outside ofthe franie or casing.,-V The 'adjustment of the distance of the two or more tools from each yother is. effected by a screw` spindle which actuates corresponding *number of removable ridersor: ythe like which are disposednpmi said-angularly displaceable; arms.- Ordinarily the adjustment 'ofgthe-toolswill be effected by first locking one nof the angularly movable yarms in Yposition by thehopera# setting thevtools at vthefproper distance from each -otherwhile the device is in the mouth ample one; ofthe Ypossibleforms of embodi-` Y ment of this invention.Y A

,f Figure,il` ofthev drawing yshows on a some; what enlarged scale an anglefpieceorholder vaccording vtdthis.invention in elevation with parts in sectionfon theline of Eigure 2 in vertical, longitudinal section; Figure 2 is a. planview of the devicewith thecovers removedr-Fignre,Sis a cross-section on the iineC-D. of vFigure-'2,A and Figure 4is a side lelevation yof the .entire device; Figure 5 isatop plan 'view showing Vthe engagement of the set screws,` andthe operation of the `adjusting screw-spindle.: Figure 6i iis." a detail of the U-shaped setting means. it Y In the anglefpiece or holderl shownl particularly in Figures l toB of the drawings afnumber ofparts usually employed in the ordinary angle piece for a'single toolliave been employed in connection with this in-y vention.l Upon the handle l with the driv inggear wheel 3 a casing/6 is screw-threadl edlyisecured and .is tightly :closed` on all sides by means of the Yupper cover 7 (and thev lower cover '8.'"I`,he`y screws or bolts yconnecting the ycovers to fthe casing are not shown in the drawings.` The'shaft 9 journaled'in tliefc'overs'fand 8. A pinion 10 is keyedv to the shaft 9 and uponftsv hub a-gear 11 is provided :and adapted to engage fthe. driving( gear-.wheel "3'. The pinion P Ari-:N

l tion of one ofthe set'screws, andl by then io envies we vpatitas 12 er equal size (rig. ff

2) upon the hubs of which gears 13 are provided, and which are keyed to the driving shafts 14:. The wall `15 of the casing within the casing recedes with relation to the shafts and constitutes a partition therebev` Ithe cover 8 respectively. The shafts 14ivare journalled at their upper ends in the cover 7 and at their lower ends in the caps 16. Into the said caps or sleeves 1G 'two or more projecting guide arms 5 Yfor the ltools are screw-threadedly secured and are provided with the gear wheels 4l.V These gear WheelsV 4 are lin engagement with the gear V13 on shaft r 14.`l` f The frame or angle piece according to this J invention operates substantially vas follows:

lBy means of the gear wheel 3 and by way of the ge'ar'fll motionv isimparted to the piniony 10 which in turn drives the Vtwo pinions 12 which are mounted for free rotation with Vtheir shafts 14 and which, by means of the gearing 13, drive the gear wheels 4 and accordingly the tools of the guide arms 5. The caps or sleeves` 16A with the guide-arms or projections 5 are 'freely rotatable around the shafts 14 in their bearings. The tools, borers and the like for instance, mounted in the guide arms 5 may be moved towards eachother until the said guide arms 5 are in contactwith each other, or they may be moved' away from each other sulicientlyto comply withk all practical requirementsof workto be performed within thev mouth of thev patient.v For the locking ofthe guide` arms orex'tensions 5 in; certain adjustedV positions setscrews 20 are provided- 'which are mounted in the casing onhousing 6 of the device and the ends of which may become engaged with screw Y threads 21 provided on the guide arms 5 or the caps 16. The adjustment of the distance of the'two tools'from each other is effected by means of a screw spindle 22 which, fby means of the rotation of a nut or wheel 24 mounted on said spindle allows of moving two riders or the like 23 axially of said spindle,` These riders, forks'or tlie like are straddhngly mounted upon the Vtwo angudisplaceable guide i armsV or extento each other is used from time'to time, andY particularlyV after any possible reparation of the partsfor the purpose of Watcl'iing. and

ascertaining the parallel direction ofY the guide arms 5. This is effected-by introducing the steel wire into the bores of the guide arms 5.

Instead of using gear operateddrivmg means worms or worm-wheels or the like maybe employed. An intermediate elbow piece or the like may be inserted 1n the device in the samey manner as ordinarily employed in angle pieces or holders intended for one tool only.

There is sufficient free space in the device described between and at the side of the guide arms to enable the operator to obother than imposed by the scope of theL claims hereunto appended.'

I claim 1. In a device of housing, prime driving means entering the housing at one side thereof, cap-like casings Within the housing,'movable and adjustable tool-guiding holders extending from -the housing and secured to the casings, driving means within said casings and secured to the holders, a partition between'the casing and the prime driving means, means operatively connecting the several driving means, and-adjusting means intermediate the holders.

ani-a device of thi-,kind described, a

housing, prime. driving means within the housing,.rotatable and adjustable tool holdersprojecting `from said housing, separate driving meanson each' of said tool holders within the housing and engaging the prime driving means, a cap-like casing-for each of said tool holders andV secured thereto and enclosing the tool driving means, and means to adjust and to lock theiholders in position.Vl`

3. In a device of theV kind described, a housing, prime driving means within the' housing, protecting and encasing means for the prime moving means, wo parallel, angularly displaceable toolv olders entering the housing and outwardlyextending therefrom, driving means, separately disposed on the inner ends of the' tool holders within the housing and engaging the prime drivingmeans, cap-like casing for each of the inner ends of t-he toolholders surrounding the driving means thereof and rotatable therewith, substantially screw-like locking and vsetting means-onY the housing and entering the same and engageable with the tool holders. i Y *Y MAX FLEISCHHACKER.

the kind described, a

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